

// #include "one-inst-asm-streamer.cc"

// #include "llvm-c/Disassembler.h"
// #include "llvm-c/Target.h"
#include <stdio.h>

// #include "Disassembler.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
// #include "llvm/MC/MCTargetOptionsCommandFlags.inc"
// #include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"

#include "llvm/AsmParser/Parser.h"

using namespace llvm;

// StringRef TripleName("aarch64-unknown-unknown");
// StringRef OutputFilename("-");
// std::string FeaturesStr("");
// StringRef MCPU("");
// int OutputAsmVariant = 1;
// StringRef InputFilename("/home/long/work/sample/llvm/assembler/a64.i");



StringRef TripleName("riscv64-unknown-unknown");
StringRef OutputFilename("-");
std::string FeaturesStr("");
StringRef MCPU("");
int OutputAsmVariant = 1;
StringRef InputFilename("/home/long/work/sample/llvm/assembler/rv64.i");
StringRef ArchName("riscv64");

static const Target* GetTarget(const char* ProgName)
{
    // Figure out the target triple.
    // if (TripleName.empty())
    //   TripleName = sys::getDefaultTargetTriple();
    Triple TheTriple(Triple::normalize(TripleName));

    // Get the target specific parser.
    std::string Error;
    // const Target *TheTarget = TargetRegistry::lookupTarget("ArchName", TheTriple,
    //                                                        Error);
    const Target* TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
        Error);
    if (!TheTarget) {
        printf("=================\n");
        WithColor::error(errs(), ProgName) << Error;
        return nullptr;
    }

    // Update the triple name and return the found target.
    // TripleName = TheTriple.getTriple();
    return TheTarget;
}

static MCTargetOptions InitMCTargetOptionsFromFlags()
{
    MCTargetOptions Options;
    Options.MCRelaxAll = true;
    Options.MCIncrementalLinkerCompatible = true;
    // Options.DwarfVersion = DwarfVersion;
    Options.ShowMCInst = true;
    // Options.ABIName = ABIName;
    Options.MCFatalWarnings = true;
    Options.MCNoWarn = false;
    Options.MCNoDeprecatedWarn = false;
    return Options;
}

// static int fillCommandLineSymbols(MCAsmParser& Parser)
// {
//     for (auto& I : DefineSymbol) {
//         auto Pair = StringRef(I).split('=');
//         auto Sym = Pair.first;
//         auto Val = Pair.second;

//         if (Sym.empty() || Val.empty()) {
//             WithColor::error() << "defsym must be of the form: sym=value: " << I
//                                << "\n";
//             return 1;
//         }
//         int64_t Value;
//         if (Val.getAsInteger(0, Value)) {
//             WithColor::error() << "value is not an integer: " << Val << "\n";
//             return 1;
//         }
//         Parser.getContext().setSymbolValue(Parser.getStreamer(), Sym, Value);
//     }
//     return 0;
// }

static int AssembleInput(const char* ProgName, const Target* TheTarget,
    SourceMgr& SrcMgr, MCContext& Ctx, MCStreamer& Str,
    MCAsmInfo& MAI, MCSubtargetInfo& STI,
    MCInstrInfo& MCII, MCTargetOptions const& MCOptions)
{
    std::unique_ptr<MCAsmParser> Parser(
        createMCAsmParser(SrcMgr, Ctx, Str, MAI));
    std::unique_ptr<MCTargetAsmParser> TAP(
        TheTarget->createMCAsmParser(STI, *Parser, MCII, MCOptions));

    if (!TAP) {
        WithColor::error(errs(), ProgName)
            << "this target does not support assembly parsing.\n";
        return 1;
    }

    // int SymbolResult = fillCommandLineSymbols(*Parser);
    // if (SymbolResult)
    //     return SymbolResult;
    // Parser->setShowParsedOperands(ShowInstOperands);
    Parser->setShowParsedOperands(false);
    Parser->setTargetParser(*TAP);
    // Parser->getLexer().setLexMasmIntegers(LexMasmIntegers);

    // int Res = Parser->Run(NoInitialTextSection);
    int Res = Parser->Run(false);

    return Res;
}

static std::unique_ptr<ToolOutputFile> GetOutputStream(StringRef Path,
    sys::fs::OpenFlags Flags)
{
    std::error_code EC;
    auto Out = std::make_unique<ToolOutputFile>(Path, EC, Flags);
    if (EC) {
        WithColor::error() << EC.message() << '\n';
        return nullptr;
    }

    return Out;
}

#include "inc.h"
int test_1(int argc, char const* argv[])
{

    InitLLVM X(argc, argv);

    // Initialize targets and assembly printers/parsers.
    llvm::InitializeAllTargetInfos();
    llvm::InitializeAllTargetMCs();
    llvm::InitializeAllAsmParsers();
    llvm::InitializeAllDisassemblers();

    // Register the target printer for --version.
    cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);

    cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
    const MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
    // setDwarfDebugFlags(argc, argv);

    // setDwarfDebugProducer();

    const char* ProgName = argv[0];
    const Target* TheTarget = GetTarget(ProgName);
    if (!TheTarget)
        return 1;
    // Now that GetTarget() has (potentially) replaced TripleName, it's safe to
    // construct the Triple object.
    Triple TheTriple(TripleName);

    ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr = MemoryBuffer::getFileOrSTDIN(InputFilename);
    if (std::error_code EC = BufferPtr.getError()) {
        WithColor::error(errs(), ProgName)
            << InputFilename << ": " << EC.message() << '\n';
        return 1;
    }
    MemoryBuffer* Buffer = BufferPtr->get();

    SourceMgr SrcMgr;

    // Tell SrcMgr about this buffer, which is what the parser will pick up.
    SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());

    // Record the location of the include directories so that the lexer can find
    // it later.
    // SrcMgr.setIncludeDirs(IncludeDirs);

    std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
    assert(MRI && "Unable to create target register info!");

    std::unique_ptr<MCAsmInfo> MAI(
        TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
    assert(MAI && "Unable to create target asm info!");

    // MAI->setRelaxELFRelocations(RelaxELFRel);

    // if (CompressDebugSections != DebugCompressionType::None) {
    //     if (!zlib::isAvailable()) {
    //         WithColor::error(errs(), ProgName)
    //             << "build tools with zlib to enable -compress-debug-sections";
    //         return 1;
    //     }
    //     MAI->setCompressDebugSections(CompressDebugSections);
    // }
    // MAI->setPreserveAsmComments(PreserveComments);

    // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
    // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
    MCObjectFileInfo MOFI;
    MCContext Ctx(MAI.get(), MRI.get(), &MOFI, &SrcMgr, &MCOptions);
    // MOFI.InitMCObjectFileInfo(TheTriple, PIC, Ctx, LargeCodeModel);
    MOFI.InitMCObjectFileInfo(TheTriple, true, Ctx, false);

    // if (SaveTempLabels)
    //     Ctx.setAllowTemporaryLabels(false);

    // Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
    // Default to 4 for dwarf version.
    // unsigned DwarfVersion = MCOptions.DwarfVersion ? MCOptions.DwarfVersion : 4;
    // if (DwarfVersion < 2 || DwarfVersion > 5) {
    //     errs() << ProgName << ": Dwarf version " << DwarfVersion
    //            << " is not supported." << '\n';
    //     return 1;
    // }
    // Ctx.setDwarfVersion(DwarfVersion);
    // if (!DwarfDebugFlags.empty())
    //     Ctx.setDwarfDebugFlags(StringRef(DwarfDebugFlags));
    // if (!DwarfDebugProducer.empty())
    //     Ctx.setDwarfDebugProducer(StringRef(DwarfDebugProducer));
    // if (!DebugCompilationDir.empty())
    //     Ctx.setCompilationDir(DebugCompilationDir);
    // else {
    //     // If no compilation dir is set, try to use the current directory.
    //     SmallString<128> CWD;
    //     if (!sys::fs::current_path(CWD))
    //         Ctx.setCompilationDir(CWD);
    // }
    // for (const auto& Arg : DebugPrefixMap) {
    //     const auto& KV = StringRef(Arg).split('=');
    //     Ctx.addDebugPrefixMapEntry(KV.first, KV.second);
    // }
    // if (!MainFileName.empty())
    //     Ctx.setMainFileName(MainFileName);
    // if (GenDwarfForAssembly)
    //     Ctx.setGenDwarfRootFile(InputFilename, Buffer->getBuffer());

    // // Package up features to be passed to target/subtarget
    // std::string FeaturesStr;
    // if (MAttrs.size()) {
    //     SubtargetFeatures Features;
    //     for (unsigned i = 0; i != MAttrs.size(); ++i)
    //         Features.AddFeature(MAttrs[i]);
    //     FeaturesStr = Features.getString();
    // }

    // sys::fs::OpenFlags Flags = (FileType == OFT_AssemblyFile) ? sys::fs::OF_Text
    //                                                           : sys::fs::OF_None;

    sys::fs::OpenFlags Flags = sys::fs::OF_Text;

    std::unique_ptr<ToolOutputFile> Out = GetOutputStream(OutputFilename, Flags);
    if (!Out)
        return 1;

    // std::unique_ptr<ToolOutputFile> DwoOut;
    // if (!SplitDwarfFile.empty()) {
    //     if (FileType != OFT_ObjectFile) {
    //         WithColor::error() << "dwo output only supported with object files\n";
    //         return 1;
    //     }
    //     DwoOut = GetOutputStream(SplitDwarfFile, sys::fs::OF_None);
    //     if (!DwoOut)
    //         return 1;
    // }

    std::unique_ptr<buffer_ostream> BOS;
    raw_pwrite_stream* OS = &Out->os();
    std::unique_ptr<MCStreamer> Str;

    std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
    std::unique_ptr<MCSubtargetInfo> STI(
        TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));

    MCInstPrinter* IP = nullptr;
    /* if (FileType == OFT_AssemblyFile)  */ {
        IP = TheTarget->createMCInstPrinter(Triple(TripleName), OutputAsmVariant,
            *MAI, *MCII, *MRI);

        if (!IP) {
            WithColor::error()
                << "unable to create instruction printer for target triple '"
                << TheTriple.normalize() << "' with assembly variant "
                << OutputAsmVariant << ".\n";
            return 1;
        }

        // Set the display preference for hex vs. decimal immediates.
        // IP->setPrintImmHex(PrintImmHex);
        IP->setPrintImmHex(true);

        // Set up the AsmStreamer.
        std::unique_ptr<MCCodeEmitter> CE;
        // if (ShowEncoding)
        if (true)
            CE.reset(TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx));

        std::unique_ptr<MCAsmBackend> MAB(
            TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
        auto FOut = std::make_unique<formatted_raw_ostream>(*OS);
        // Str.reset(
        //     TheTarget->createAsmStreamer(Ctx, std::move(FOut), /*asmverbose*/ true,
        //         /*useDwarfDirectory*/ true, IP,
        //         // std::move(CE), std::move(MAB), ShowInst));
        //         std::move(CE), std::move(MAB), true));

        Str.reset(
            // TheTarget->createAsmStreamer
            llvm::kify_nncreateAsmStreamer(Ctx, std::move(FOut), /*asmverbose*/ true,
                /*useDwarfDirectory*/ true, IP,
                // std::move(CE), std::move(MAB), ShowInst));
                std::move(CE), std::move(MAB), true, TheTarget));
                
        // MCStreamer* kifycreateNullStreamer(MCContext & Context);
        // Str.reset(
        //     kifycreateNullStreamer(Ctx));
    }
    //  else if (FileType == OFT_Null) {
    //     Str.reset(TheTarget->createNullStreamer(Ctx));
    // } else {
    //     assert(FileType == OFT_ObjectFile && "Invalid file type!");

    //     // Don't waste memory on names of temp labels.
    //     Ctx.setUseNamesOnTempLabels(false);

    //     if (!Out->os().supportsSeeking()) {
    //         BOS = std::make_unique<buffer_ostream>(Out->os());
    //         OS = BOS.get();
    //     }

    //     MCCodeEmitter* CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
    //     MCAsmBackend* MAB = TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions);
    //     Str.reset(TheTarget->createMCObjectStreamer(
    //         TheTriple, Ctx, std::unique_ptr<MCAsmBackend>(MAB),
    //         DwoOut ? MAB->createDwoObjectWriter(*OS, DwoOut->os())
    //                : MAB->createObjectWriter(*OS),
    //         std::unique_ptr<MCCodeEmitter>(CE), *STI, MCOptions.MCRelaxAll,
    //         MCOptions.MCIncrementalLinkerCompatible,
    //         /*DWARFMustBeAtTheEnd*/ false));
    //     if (NoExecStack)
    //         Str->InitSections(true);
    // }

    // Use Assembler information for parsing.
    Str->setUseAssemblerInfoForParsing(true);

    int Res = 1;
    bool disassemble = false;
    // switch (Action) {
    // case AC_AsLex:
    //     Res = AsLexInput(SrcMgr, *MAI, Out->os());
    //     break;
    // case AC_Assemble:
    Res = AssembleInput(ProgName, TheTarget, SrcMgr, Ctx, *Str, *MAI, *STI,
        *MCII, MCOptions);
    //     break;
    // case AC_MDisassemble:
    //     assert(IP && "Expected assembly output");
    //     IP->setUseMarkup(true);
    //     disassemble = true;
    //     break;
    // case AC_Disassemble:
    //     disassemble = true;
    //     break;
    // }
    // if (disassemble)
    //     Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str, *Buffer,
    //         SrcMgr, Ctx, Out->os(), MCOptions);

    // // Keep output if no errors.
    // if (Res == 0) {
    //     Out->keep();
    //     if (DwoOut)
    //         DwoOut->keep();
    // }
    return Res;
}

int main(int argc, char const* argv[])
{
    test_1(argc, argv);
    return 0;
}
